array_slice.php

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autumn 2023-05-16 19:12:08 博主文章分类：web

文章标签 数组 html php 文章分类 HarmonyOS 后端开发

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 <html>
  <head>
   <title> array_slice.php </title>
   <meta charset="UTF-8">
   <meta name="Author" content="">
   <meta name="Keywords" content="">
   <meta name="Description" content="">
  </head> <body>
 <?php
 $input = array("a", "b", "two"=>"c", "d", "e");
 var_dump($input);
 echo '<hr><hr><hr>';
 $output = array_slice($input, 2); // 返回 "c", "d", and "e"
 echo '<hr><hr><hr>';
 var_dump($output);
 echo '<hr><hr><hr>';
 $output = array_slice($input, -2, 1); // 返回 "d"
 echo '<hr><hr><hr>';
 var_dump($output);
 echo '<hr><hr><hr>';
 $output = array_slice($input, 0, 3); // 返回 "a", "b", and "c"
 echo '<hr><hr><hr>';
 var_dump($output);
 echo '<hr><hr><hr>';
 // 输出部分数组成员，注意数组索引同原始数组索引的变化
 print_r(array_slice($input, 2, -1));//Array ( [two] => c [0] => d ) //更新数字索引
 echo "<hr>";
 //设定preserve_keys 参数为true，保证数组索引和原来数组一致
 //即元素c,d 在input 中索引为two 和3，则新数组索引一样为two 和3
 print_r(array_slice($input, 2, -1, true));//Array ( [two] => c [2] => d ) //保存原始数字索引
 echo "<br>";
 ?>
  </body>
 </html> 
array
  0 => string 'a' (length=1)
  1 => string 'b' (length=1)
  'two' => string 'c' (length=1)
  2 => string 'd' (length=1)
  3 => string 'e' (length=1)
 
array
  'two' => string 'c' (length=1)
  0 => string 'd' (length=1)
  1 => string 'e' (length=1)
 
array
  0 => string 'd' (length=1)
 
array
  0 => string 'a' (length=1)
  1 => string 'b' (length=1)
  'two' => string 'c' (length=1)
 
Array ( [two] => c [0] => d ) 
Array ( [two] => c [2] => d )